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论文类型：会议论文

发表时间：2010-11-06

收录刊物：EI、CPCI-S、Scopus

卷号：146-147

页面范围：160-165

关键字：Hot forming; 22MnB5; Tempering temperature; Kahn tear; Fracture toughness

摘要：The influence of low tempering temperature (TT) on mechanical properties and fracture toughness of ultra high strength boron steel 22MnB5 for hot forming was investigated by tensile and Kahn tearing experiments. Compared with the conventional quenchable boron steel, The results show that the toughness of tested steel are both preferable when tempered at 200 degrees C, 40min. When TT between 100 degrees C similar to 200 degrees C, The tear strength (TS) and unit propagation energy (UPE) of quenched steel heightened along with the temperature raised, but in 200-350 degrees C temperature range, the toughness appears negatively growth. Appropriate TT could improve the mechanical properties and fracture toughness obviously, and the temper brittleness can be avoided.